Validation always successful

I'm using Validation.ValidateFromConfiguration(user, "NU2"); to validate business objects.

But the rule-set NU2 doesn't exists in the config. Yet this doesn't fail, no exception, even IsValid is set to true. I've dug into the code and noticed that if the rule-set is not found it returns emptyValidator.

I don't think it's correct behaviour, it should throw an exception in that case or at least invalidate object. Is there a way to determine if given rule-set exists for given type of object?